555 Timer Clap Switch

This 555 timer clap
switch circuit electronic project is designed using some common
electronic parts. This 555 timer clap switch circuit electronic project
operates from a distance of up to 10 meters from the microphone . Signal
from microphone is amplified by transistors T1, T2 and T3. Diode D1
detects clap signals and the resulting positive voltage is applied to
the base of the transistor T4 .

Circuit diagram

T5 transistor will amplify the output signal from the T4 transistor
and will trigger the monostable multivibrator based on the 555 timer IC.
The output signal from the 555 timer IC is used as a clock for a 4017
decade counter. For each successive clap T6 conducts and cuts off
alternately , resulting and on of switching for the lamp . Triac used
for this project can be a 8T44A or ST044 and can drive load up to 4 amp
rating . The 12 volt for powering this electronic circuit project is
derived directly from the mains using rectifier diode D2 and some other
components like R16 and ZD1 zener diode.